Color Matching

As for the color matching: there are obviously different white balance settings on these two.

By @D Fosse

And the reason why the white balance is different might affect how to fix the problem.

If you know the stage lighting is consistent during this scene, then use standard correction techniques such as the ones D Fosse describes. You can sample the white balance from one image, and apply the same value to the other image. That should only take a few seconds.

However, if you know the colors changed because the stage lighting was changing between frames (some  colored lights were being added or taken away), then you have to decide what to do:

If you want to preserve the intention of the lighting director (the colors are supposed to look different because they were changing the lighting), decide what you believe to be the neutral white balance Temp and Tint values, and apply those to all frames. 

If you want the colors in both images to match no matter what the lights were doing, then you have to white balance each frame separately. And this might not work perfectly, because if the light colors were changing, it might be difficult or impossible to make the colors match exactly. For example, if the lights shifted toward red, one picture might have too little green in it to fully match the other picture.

A better generative AI prompt for this will be "remove debris". It will retain the structure of the floor. 

For question 1, I tried using the screenshot but the dresses will not become the same color no matter what. This might be the stage lighting that prohibits that. If there were gels used on the lights, you get metamerism, an effect where the same color appears different because of the spectrum of the light source and you can't really correct but for some photoshop trickery. If you shot raw (hopefully you did), you can try syncing the white balance settings between the two images.